All the incoming calls we get over our sip trunk with voipvoip.com drop after 900 seconds. I think this has something to do with session timers, but I don’t know what.
Ultimately the call drops with " Got SIP response 420 “Bad Extension” back from 220.127.116.11" after 900 seconds. More precisely if I look at packets, I see
A SIP invite from voipvoip with session-expires 1800, supported timer
Then all goes well for 900 seconds, after which my asterisk sends back and INVITE with Require timer and voipvoip answers with status 420, and unsupported timer.
Why is my asterisk sending back this invite after 900 seconds and requiring timer. Aill I see in sip show settings is
Session Timers: Accept
Session Refresher: uas
Session Expires: 1800 secs
Session Min-SE: 90 secs